CVE-2017-11103

Heimdal before 7.4 allows remote attackers to impersonate services withOrpheus' Lyre attacks because it obtains service-principal names in a waythat violates the Kerberos 5 protocol specification. In_krb5_extract_ticket() the KDC-REP service name must be obtained from theencrypted version stored in 'enc_part' instead of the unencrypted versionstored in 'ticket'. Use of the unencrypted version provides an opportunityfor successful server impersonation and other attacks. NOTE: this CVE isonly for Heimdal and other products that embed Heimdal code; it does notapply to other instances in which this part of the Kerberos 5 protocolspecification is violated.